condition mean min max ZT0-3 69.783241 69.783241 69.783241 ZT4-7 72.958331 72.958331 72.958331 ZT8-11 83.9797075 83.9797075 83.9797075 ZT12-15 72.6111365 72.6111365 72.6111365 ZT16-19 99.1756585 99.1756585 99.1756585 ZT20-23 88.604052 88.604052 88.604052